ACS Organic Chemistry Practice Test
$69.00
Unlock the full practice quiz
Get complete access to the questions, explanations and printable quiz resources.
Full access: unlock all quiz questions and explanations.
Printable review: access the full quiz PDF with correct answers after purchase.
About this Exam
Prepare with the ACS Organic Chemistry Practice Test practice quiz. This question bank includes 10 questions covering carbanion, mass, oxidation, alcohol, and yields. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.
Sample Questions
Question
1
For a conjugate acid-base pair, which relation is correct at a given temperature?
Explanation:
Relates to how acid and base constants for conjugate pairs multiply to the autoionization constant of water. For an acid HA, Ka = [H+][A-]/[HA]. For its conjugate base A-, Kb = [HA][OH-]/[A-]. Multiplying these two expressions gives Ka × Kb = ([H+][A-]/[HA]) × ([HA][OH-]/[A-]) = [H+][OH-] = Kw, the water ion-product at that temperature. So the correct relation is that the product of Ka and Kb equals Kw. This is temperature-dependent (Kw changes with temperature), and it also underpins the familiar pKa + pKb = pKw relationship. The other proposed relations don’t follow from the definitions of Ka and Kb.
Question
2
What does the Atomic Mass Number represent?
Explanation:
The mass number is the total count of nucleons in the nucleus, which means protons plus neutrons. It equals Z + N, where Z is the number of protons (defining the element) and N is the number of neutrons. Electrons don’t contribute to this count because their mass is negligible and they sit outside the nucleus. Different isotopes have the same number of protons but different numbers of neutrons, giving different mass numbers. So the mass number represents protons plus neutrons.
Question
3
Swern oxidation of a primary alcohol yields which product?
Explanation:
Swern oxidation is a mild, non-aqueous method that converts primary alcohols to aldehydes. The oxidant is generated from dimethyl sulfoxide (DMSO) and oxalyl chloride under cold conditions with a base. This setup oxidizes the alcohol to an aldehyde and then, under these conditions, there isn’t leftover oxidizing power or water to push the aldehyde further to a carboxylic acid. That’s why a primary alcohol ends up as an aldehyde in Swern oxidation. For a secondary alcohol, the oxidation stops at a ketone, reflecting the difference in hydrogen removal at the two possible sites.
Question
4
Molar mass, as a concept, is defined as which of the following?
Explanation:
The main idea is that molar mass is the mass of one mole of a substance, expressed in grams per mole. This ties microscopic masses to a macroscopic amount of material: you can take the number of moles and multiply by this mass to get the total grams you have. For a pure element, the molar mass in g/mol equals the atomic mass in atomic mass units (amu). For a compound, you add up the atomic masses of all atoms in the formula, accounting for how many of each atom are present (for example, water has a molar mass about 18.015 g/mol: 2 × 1.008 for hydrogen plus 16.00 for oxygen). It’s not the mass of a single atom in grams, and it isn’t the mass of solvent per mole or a volume per mole—that would be molar volume. Therefore, the correct definition is the mass per mole, expressed as g/mol.
Question
5
What are the values for STP?
Explanation:
STP refers to the standard conditions used for gas calculations, defined as a temperature of 0°C (273.15 K) and a pressure of 1 atm. Under these conditions, an ideal gas has a molar volume of about 22.4 L per mole, which is a handy reference for gas-volume problems. Choosing 0°C and 1 atm matches that standard pairing. A temperature of 25°C with 1 atm is standard room conditions (often called RT) and gives a molar volume around 24.0 L per mole, not the STP value. A temperature of -273°C is absolute zero—particles cannot have a meaningful gas pressure there. A pressure of 0.5 atm is simply not the standard pressure used for STP. Some texts use 1 bar instead of 1 atm, which is close, but the classic STP definition is 0°C and 1 atm.
Ready to test your knowledge?
Buy Now to AccessAdditional Information
ACS Organic Chemistry Practice Test
This practice set contains 10 questions from the matching question bank and focuses on carbanion, mass, oxidation, alcohol, and yields. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.
This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.
Frequently Asked Questions
This quiz contains a total of 10 practice questions carefully selected to test your knowledge on this subject.
Yes, you will have exactly 0 minutes to complete the exam. A countdown timer will be visible once you start.
Yes, you can retake this practice test as many times as you need. The questions and options may be randomized on subsequent attempts to ensure comprehensive learning.
Reviews
5.0
Based on 0 reviews
Leave a Review
No reviews yet. Be the first to review!